my $buildStatus = 0;

    my $outputCreated = 1; # i.e., the Nix build succeeded (but it could be a positive failure)

        $buildStatus = $res == 0 ? 0 : 1;

        $outputCreated = $res == 0;
    }
    my $buildStatus;
    
    if ($outputCreated) {
        # "Positive" failures, e.g. the builder returned exit code 0
        # but flagged some error condition.
        $buildStatus = -e "$outPath/nix-support/failed" ? 2 : 0;
    } else {
        $buildStatus = 1; # = Nix failure

        if ($buildStatus == 0) {

        if ($outputCreated) {

    my %newInputInfo = %{$inputInfo}; $inputInfo = \%newInputInfo; # clone

            $project, $jobset, $inputInfo, $nixExprPath,

            $project, $jobset, {}, $nixExprPath,